static struct resource *
isab_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct isab_pci_softc *sc;
int bar;
if (device_get_parent(child) != dev)
return bus_generic_alloc_resource(dev, child, type, rid, start,
end, count, flags);
switch (type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
/*
* For BARs, we cache the resource so that we only allocate it
* from the PCI bus once.
*/
bar = PCI_RID2BAR(*rid);
if (bar < 0 || bar > PCIR_MAX_BAR_0)
return (NULL);
sc = device_get_softc(dev);
if (sc->isab_pci_res[bar].ip_res == NULL)
sc->isab_pci_res[bar].ip_res = bus_alloc_resource(dev, type,
rid, start, end, count, flags);
if (sc->isab_pci_res[bar].ip_res != NULL)
sc->isab_pci_res[bar].ip_refs++;
return (sc->isab_pci_res[bar].ip_res);
}
return (BUS_ALLOC_RESOURCE(device_get_parent(dev), child, type, rid,
start, end, count, flags));
}
static struct vga_resource *
lookup_res(struct vga_pci_softc *sc, int rid)
{
int bar;
if (rid == PCIR_BIOS)
return (&sc->vga_bios);
bar = PCI_RID2BAR(rid);
if (bar >= 0 && bar <= PCIR_MAX_BAR_0)
return (&sc->vga_bars[bar]);
return (NULL);
}
static int
isab_pci_release_resource(device_t dev, device_t child, int type, int rid,
struct resource *r)
{
struct isab_pci_softc *sc;
int bar, error;
if (device_get_parent(child) != dev)
return bus_generic_release_resource(dev, child, type, rid, r);
switch (type) {
case SYS_RES_MEMORY:
case SYS_RES_IOPORT:
/*
* For BARs, we release the resource from the PCI bus
* when the last child reference goes away.
*/
bar = PCI_RID2BAR(rid);
if (bar < 0 || bar > PCIR_MAX_BAR_0)
return (EINVAL);
sc = device_get_softc(dev);
if (sc->isab_pci_res[bar].ip_res == NULL)
return (EINVAL);
KASSERT(sc->isab_pci_res[bar].ip_res == r,
("isa_pci resource mismatch"));
if (sc->isab_pci_res[bar].ip_refs > 1) {
sc->isab_pci_res[bar].ip_refs--;
return (0);
}
KASSERT(sc->isab_pci_res[bar].ip_refs > 0,
("isa_pci resource reference count underflow"));
error = bus_release_resource(dev, type, rid, r);
if (error == 0) {
sc->isab_pci_res[bar].ip_res = NULL;
sc->isab_pci_res[bar].ip_refs = 0;
}
return (error);
}
return (BUS_RELEASE_RESOURCE(device_get_parent(dev), child, type,
rid, r));
}
static int
decode_tuple_bar(device_t cbdev, device_t child, int id,
int len, uint8_t *tupledata, uint32_t start, uint32_t *off,
struct tuple_callbacks *info, void *argp)
{
struct cardbus_devinfo *dinfo = device_get_ivars(child);
int type;
uint8_t reg;
uint32_t bar;
if (len != 6) {
device_printf(cbdev, "CIS BAR length not 6 (%d)\n", len);
return (EINVAL);
}
reg = *tupledata;
len = le32toh(*(uint32_t*)(tupledata + 2));
if (reg & TPL_BAR_REG_AS)
type = SYS_RES_IOPORT;
else
type = SYS_RES_MEMORY;
bar = reg & TPL_BAR_REG_ASI_MASK;
if (bar == 0) {
device_printf(cbdev, "Invalid BAR type 0 in CIS\n");
return (EINVAL); /* XXX Return an error? */
} else if (bar == 7) {
/* XXX Should we try to map in Option ROMs? */
return (0);
}
/* Convert from BAR type to BAR offset */
bar = PCIR_BAR(bar - 1);
if (type == SYS_RES_MEMORY) {
if (reg & TPL_BAR_REG_PREFETCHABLE)
dinfo->mprefetchable |= (1 << PCI_RID2BAR(bar));
/*
* The PC Card spec says we're only supposed to honor this
* hint when the cardbus bridge is a child of pci0 (the main
* bus). The PC Card spec seems to indicate that this should
* only be done on x86 based machines, which suggests that on
* non-x86 machines the addresses can be anywhere. Since the
* hardware can do it on non-x86 machines, it should be able
* to do it on x86 machines too. Therefore, we can and should
* ignore this hint. Furthermore, the PC Card spec recommends
* always allocating memory above 1MB, contradicting the other
* part of the PC Card spec, it seems. We make note of it,
* but otherwise don't use this information.
*
* Some Realtek cards have this set in their CIS, but fail
* to actually work when mapped this way, and experience
* has shown ignoring this big to be a wise choice.
*
* XXX We should cite chapter and verse for standard refs.
*/
if (reg & TPL_BAR_REG_BELOW1MB)
dinfo->mbelow1mb |= (1 << PCI_RID2BAR(bar));
}
return (0);
}
